Deciduous is a designation indicating a plant sheds its leaves at the end of the growing season. The term is used primarily in reference to trees and shrubs, in contrast with those that are evergreen.. It is pronounced dih-SIJ-oo-uhs. To remember what deciduous means, try relating it to the word, decadent..
viscosity. n, pl-ties. 1. the state or property of being viscous. 2. (General Physics) physics. a. the extent to which a fluid resists a tendency to flow. b. Also called: absolute viscosity a measure of this resistance, equal to the tangential stress on a liquid undergoing streamline flow divided by its velocity gradient. It is measured in newton seconds per metre squared.
Viscosity is the measure of the internal friction of a fluid. This friction becomes apparent when a layer of fluid is made to move in relation to another layer. The greater the friction, the greater the amount of force required to cause this movement, which is called shear.